121 Colregs Midterm Quiz B 70

Sidelights can be seen right ahead to 22.5 degrees abaft the beam. This means that the sidelights can be seen in a sector of 45 degrees, starting from straight ahead and extending 22.5 degrees to each side of the vessel's centerline. Therefore, it is true that sidelights can be seen in this specific angle.

The length of the vessel can be determined by the length of the sound wave produced by the gond. Since the sound of the gond reached the listener, it means that the length of the sound wave is equal to the distance between the listener and the vessel. Therefore, the length of the vessel is 120 meters.

In restricted visibility, when a vessel's ability to see and be seen is limited, it is important to avoid altering course to port (left) as it could potentially lead to a collision. However, this rule does not apply to a vessel that is being overtaken by another vessel. Therefore, the statement is true.

A vessel constrained by draft making way is required to display a black cylinder day shape. This day shape indicates to other vessels that the vessel has restricted maneuverability due to its draft and is unable to deviate from its course. The black cylinder is easily recognizable and helps other vessels to take necessary precautions while navigating near the constrained vessel.

A 100 meters power driven vessel under way at night must exhibit the forward and aft masthead light. This is because according to international maritime regulations, vessels over 50 meters in length are required to display both the forward and aft masthead lights to indicate their position and direction of travel. The forward masthead light is a white light displayed at the front of the vessel, while the aft masthead light is also a white light displayed at the rear. These lights help other vessels determine the size, direction, and position of the vessel, ensuring safe navigation at night.

In restricted visibility, such as in fog or heavy rain, it is important for vessels to signal their presence to avoid collisions. The interval between sound signals is not more than 2 minutes. This means that vessels are required to sound their horn or whistle at least once every 2 minutes to alert other vessels of their presence. This helps to ensure that other vessels can take appropriate action to avoid a collision in the limited visibility conditions.

A yellow light has the same characteristic as a stern light. This means that it is a light that is visible from behind a vessel, indicating its position and direction of travel.

A vessel aground is a vessel that has run aground or is stuck on the bottom of a body of water. When a vessel is aground, it is required to display certain lights to indicate its status and to warn other vessels of its presence. The lights that a vessel aground should display are the N.U.C. (Not Under Command) lights and the anchor lights. The N.U.C. lights indicate that the vessel is unable to maneuver due to exceptional circumstances, such as being aground. The anchor lights are displayed to indicate that the vessel is not underway and is stationary. Therefore, the statement that the lights to be displayed by a vessel aground are N.U.C. and anchor lights on specified length is true.

During periods of reduced visibility, such as fog or heavy rain, it is crucial to display navigational lights on your vessel. These lights help other vessels to identify and avoid your boat, preventing collisions. Navigational lights are especially important during the day when visibility is already reduced, as they enhance your vessel's visibility and increase safety on the water. Therefore, it is necessary to display navigational lights during all periods of reduced visibility.

A vessel that is between 12 and 20 meters in length is required to have an all-round light that is visible at a range of 2 miles. This means that other vessels or observers will be able to see the light from the vessel from a distance of 2 miles or less, indicating the presence and position of the vessel. Therefore, the statement is true.

In restricted visibility, it is important for a dredger to sound a gong aft when aground. This is to alert other vessels of its presence and to prevent any potential collisions. The length of the dredger, in this case, is mentioned to emphasize the importance of sounding the gong aft, as it indicates that the vessel is large and may pose a greater risk to other vessels if not properly signaled. Therefore, the statement is true.

When a vessel is underway but stopped on the water, it indicates that the vessel is not moving but is still in operation. In this situation, the appropriate sound signal to be sounded is 2 long blasts. This signal is used to indicate that the vessel is not under command and is unable to maneuver as required by the International Regulations for Preventing Collisions at Sea (COLREGS). By sounding 2 long blasts, the vessel alerts other vessels in the vicinity about its limited ability to maneuver and warns them to take necessary actions to avoid a collision.

If a cone is placed apex upward aft of a fishing vessel engaged in trawling, it indicates that the outlying gear, such as nets or lines, extends more than 150 meters. This is because the cone serves as a visual signal to other vessels that the fishing gear is extended and caution should be taken to avoid entanglement. Therefore, the statement is true.

A vessel that emits a sound signal of one long blast followed by four short blasts is identified as a pilot vessel. Pilot vessels are responsible for guiding larger ships in and out of ports or other restricted areas. The specific sound signal is used to indicate their presence and communicate with other vessels in restricted visibility conditions.

When a power-driven vessel is towing another vessel, it must display a yellow light over a white light from its stern. The yellow light indicates that it is towing, while the white light is the standard stern light for a power-driven vessel. This configuration informs other vessels that the vessel is both power-driven and towing another vessel, allowing them to take appropriate action to avoid a collision.

When a power-driven vessel is underway but stopped on the water in restricted visibility, it should sound two long blasts as the appropriate sound signal. This signal is used to indicate that the vessel is not moving and is at anchor or aground. It alerts other vessels in the vicinity to exercise caution and avoid any potential collision.

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The range of visibility for the side lights of a vessel is determined by its length. In this case, since the vessel is 8 meters in length, the range of visibility for its side lights is 1 mile. This means that other vessels or objects in the vicinity can see the side lights of this vessel from a distance of up to 1 mile.

In this situation, the correct action is to maintain course and speed as the stand-on vessel. According to the International Regulations for Preventing Collisions at Sea (COLREGS), the vessel showing a cone apex down is a sailing vessel. As the stand-on vessel, you have the right of way and should maintain your course and speed to allow the other vessel to maneuver and pass safely.

A vessel of less than 12 meters engaging in diving operations is required to display the lights and shape as specified in rule 27. This rule is in place to ensure the safety of the vessel and its occupants, as well as to notify other vessels in the area of the diving operations taking place. By displaying the appropriate lights and shape, other vessels can take the necessary precautions and avoid any potential accidents or collisions. Therefore, the statement is true.

Any vessel that is able to tow other vessels would exhibit a yellow light with the same characteristics as a stern light in addition to the navigational lights. This is important for other vessels to recognize that the vessel is engaged in towing operations and to take appropriate action to avoid collision.

Rule 30 of the International Regulations for Preventing Collisions at Sea (COLREGS) specifically addresses the rules concerning anchored vessels. This rule outlines the actions that should be taken by both the anchored vessel and other vessels approaching it. It covers aspects such as the visibility of the anchor lights, the distance at which other vessels should keep from the anchored vessel, and the actions to be taken in case of potential collision. Therefore, Rule 30 is the most appropriate rule to refer to when seeking information about the rules concerning anchored vessels.

The correct answer is both the tug and tow. When a tow is more than 200 meters, it is required for both the towing vessel (tug) and the vessel being towed to display the towing diamond. This diamond-shaped sign helps other vessels to identify that there is a tow in progress and take necessary precautions to avoid any collisions or accidents. By displaying the towing diamond, both the tug and tow ensure that they are visible to other vessels in the vicinity.

A vessel engaged in diving operations is required to display the prescribed lights and shape for a vessel of any length. This is important for the safety of other vessels in the vicinity, as it allows them to easily identify the diving vessel and take appropriate precautions to avoid any potential collisions or accidents. Displaying the correct lights and shape helps to ensure clear communication and awareness among all vessels in the area, reducing the risk of accidents and promoting safe diving operations.

A mine clearance vessel is required to exhibit an anchor light even when it is on duty at anchor. This is because the anchor light helps other vessels in the vicinity to identify the position of the mine clearance vessel and take necessary precautions to avoid any potential danger. The anchor light is a safety measure that ensures the visibility of the vessel, even when it is stationary at anchor, to prevent any accidental collisions or mishaps.

The vessel showing a black cone apex up forward of your beam is most likely a vessel engaged in fishing. This is because vessels engaged in fishing are required to display a black cone apex up during daylight hours to indicate their activity. This cone-shaped signal helps other vessels identify and navigate around them safely.

A towing yellow light will be carried above a vessel's stern light at anytime when towing. This means that whenever a vessel is engaged in towing another vessel or object, it must display a yellow light above its stern light. This is to alert other vessels in the vicinity that the vessel is towing and may have limited maneuverability. The presence of the towing yellow light helps to ensure the safety of both the towing vessel and other vessels in the area.

If the vessel is N.U.C. (Not Under Command) and making way at night, a total of 5 lights will be visible. These lights include the sidelights (red and green), the stern light (white), the masthead light (white), and the towing light (yellow).

The range of visibility of the stern light on a vessel is determined by regulations and is typically limited to a certain distance to ensure the safety of other vessels. In this case, the correct answer is 2 miles, meaning that the stern light on the vessel can be seen from a distance of up to 2 miles by other vessels.

A vessel not under command is a vessel that is unable to maneuver as required by the International Regulations for Preventing Collisions at Sea. According to these regulations, a vessel not under command should exhibit two masthead lights in a vertical line when underway and making way. Therefore, the given statement is false.

In a sailing vessel of more than 20 meters, a red over green all around light is not required to be exhibited below the masthead light. The International Regulations for Preventing Collisions at Sea (COLREGs) specify that a sailing vessel of more than 20 meters should exhibit a red over green light only when it is being overtaken by another vessel. Otherwise, it should display a single all-around white light. Therefore, the correct answer is False.

The question states that the side lights of the other vessel are visible from a distance of 1 mile. However, it does not provide any information about the length of the vessel. Therefore, the correct answer is that there is no specified length for the vessel.

A tugboat without a tow will produce a sound signal of one long blast. This signal is used to indicate that the tugboat is not towing any vessels or objects.

In this situation, neither vessel is considered the stand on vessel. When two vessels are crossing in fog and not in sight of one another, both vessels are required to take action to avoid a collision. They should both alter their course and speed to avoid any potential collision. Therefore, neither vessel has the right of way or is considered the stand on vessel.

In towing operations, a black diamond is not required to be exhibited by the tug and tow when the length of the tow is 150 meters. Therefore, the statement is false.

When two vessels are within sight of each other and green lights are visible from each other, it means that both vessels are approaching each other from different directions. In this situation, both vessels are considered as give way vessels, meaning they must yield the right of way to each other and take necessary actions to avoid a collision. This is because green lights indicate that the vessels are starboard side to starboard side, which requires both vessels to give way to avoid a potential collision. Therefore, the statement is true.

A vessel engaged in fishing shows the same lights signal when underway or at anchor because it is required to display the same lights regardless of its status. This is to ensure the safety of other vessels in the vicinity and to communicate its presence and activities effectively. The lights signal for a vessel engaged in fishing includes a white masthead light, a white stern light, and two all-round red lights. These lights are displayed both when the vessel is underway and when it is at anchor, distinguishing it from other types of vessels.

The statement suggests that a combined lantern can be placed on either side of the vessel, as long as it is less than 20 meters away. However, this is incorrect. According to maritime regulations, a combined lantern should be placed at the centerline of the vessel and not on either side. Therefore, the correct answer is False.

A pilot vessel when underway is required to exhibit a white masthead light and a red over white light on its mast. This combination of lights helps other vessels identify the pilot vessel and understand its role and position. The white masthead light alone is not sufficient and does not meet the requirements for a pilot vessel underway. Therefore, the given statement is false.

When a vessel is aground, it is important to distinguish it from an anchored vessel. The additional signal that should be sounded in this situation is 3 strikes before and after a rapid ringing of the bell. This combination of signals helps to clearly indicate that the vessel is aground and not simply anchored.

When intending to overtake on the other vessel's port side, the correct sound signal should be 2 long and 1 short blasts, not 1 long and 2 short blasts. This is important for communication and avoiding any potential collisions or confusion between the vessels.

If you are heading due north and you observe a vessel's green light on your port beam, it means that the vessel is on your left side. Since the green light is on the left side of a vessel, it indicates that the vessel is heading in the same direction as you, which is northward.

A vessel towing a barge alongside is required to display the same lights as a vessel towing of its length. This means that it should display the required navigation lights, such as red and green sidelights, a white stern light, and a yellow towing light at the mast. These lights are necessary to indicate the vessel's position, direction, and the fact that it is engaged in towing operations.

According to international regulations, a vessel aground is not required to sound the appropriate signal if it is less than 12 meters in length. This means that smaller vessels, such as small boats or dinghies, do not need to sound any signals when they run aground. However, larger vessels over 12 meters in length are required to sound the appropriate signals to alert other vessels of their situation.

Rule 35 of the International Regulations for Preventing Collisions at Sea (COLREGs) actually applies to sound signals, not maneuvering signals. It specifies the sound signals that vessels should use in various situations, such as when approaching a bend or when in restricted visibility. Therefore, the statement that Rule 35 applies to the maneuvering signals of vessels in sight of one another is incorrect.

A sailing vessel more than 20 meters underway at night shall exhibit red over green lights on the mast, side lights, and stern light. This combination of lights helps other vessels determine the size and type of the sailing vessel and its direction of travel. The red over green lights indicate that the sailing vessel is a sailing vessel and not a power-driven vessel. The side lights and stern light ensure that the sailing vessel is visible from all angles, allowing other vessels to navigate safely around it.

A sailing vessel less than 20 meters is best described by having a combined lantern near the top of the mast. This means that the vessel has a single lantern that combines both the red and green sidelights, which are required for vessels under 20 meters according to international maritime regulations. The combined lantern allows other vessels to easily identify the sailing vessel and determine its direction of travel at night or in low visibility conditions.

A cone apex downward does not indicate that a fishing vessel is engaged in fishing with outlying gear extending more than 150 meters. The statement is false because a cone apex downward is actually used to indicate that a vessel is restricted in its ability to maneuver.

In restricted visibility, a sea plane should sound a continuous horn or siren to alert other vessels of its presence. This is not represented by any of the options given, so the correct answer is "none of the above".

In this situation, maintaining your course and speed is the correct answer. This is because you have observed another vessel on your starboard quarter, which means it is behind and to the right of your vessel. By maintaining your course and speed, you are indicating to the other vessel that you are not changing your direction or speed, allowing them to maneuver around you safely. This is the appropriate action to take in order to avoid any potential collisions in the dense fog.